/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.confignode.procedure.impl.node;

import org.apache.iotdb.common.rpc.thrift.TConfigNodeLocation;
import org.apache.iotdb.commons.exception.runtime.ThriftSerDeException;
import org.apache.iotdb.commons.utils.ThriftConfigNodeSerDeUtils;
import org.apache.iotdb.confignode.procedure.env.ConfigNodeProcedureEnv;
import org.apache.iotdb.confignode.procedure.exception.ProcedureException;
import org.apache.iotdb.confignode.procedure.state.AddConfigNodeState;
import org.apache.iotdb.confignode.procedure.store.ProcedureType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;

/**
 * add config node procedure
 */
public class AddConfigNodeProcedure extends AbstractNodeProcedure<AddConfigNodeState> {
    private static final Logger LOG = LoggerFactory.getLogger(AddConfigNodeProcedure.class);
    private static final int RETRY_THRESHOLD = 5;

    private TConfigNodeLocation tConfigNodeLocation;

    public AddConfigNodeProcedure() {
        super();
    }

    public AddConfigNodeProcedure(TConfigNodeLocation tConfigNodeLocation) {
        super();
        this.tConfigNodeLocation = tConfigNodeLocation;
    }

    @Override
    protected Flow executeFromState(ConfigNodeProcedureEnv env, AddConfigNodeState state) {
        if (tConfigNodeLocation == null) {
            return Flow.NO_MORE_STATE;
        }
        try {
            switch (state) {
                case ADD_CONFIG_NODE_PREPARE:
                    setNextState(AddConfigNodeState.CREATE_PEER);
                    break;
                case CREATE_PEER:
                    LOG.info("Executing CREATE_PEER on {}...", tConfigNodeLocation);
                    env.addConsensusGroup(tConfigNodeLocation);
                    setNextState(AddConfigNodeState.ADD_PEER);
                    LOG.info("Successfully CREATE_PEER on {}", tConfigNodeLocation);
                    break;
                case ADD_PEER:
                    LOG.info("Executing ADD_PEER {}...", tConfigNodeLocation);
                    env.addConfigNodePeer(tConfigNodeLocation);
                    setNextState(AddConfigNodeState.REGISTER_SUCCESS);
                    LOG.info("Successfully ADD_PEER {}", tConfigNodeLocation);
                    break;
                case REGISTER_SUCCESS:
                    env.notifyRegisterSuccess(tConfigNodeLocation);
                    env.applyConfigNode(tConfigNodeLocation);
                    env.broadCastTheLatestConfigNodeGroup();
                    LOG.info("The ConfigNode: {} is successfully added to the cluster", tConfigNodeLocation);
                    return Flow.NO_MORE_STATE;
            }
        } catch (Exception e) {
            if (isRollbackSupported(state)) {
                setFailure(new ProcedureException("Add ConfigNode failed " + state));
            } else {
                LOG.error(
                        "Retrievable error trying to add config node {}, state {}",
                        tConfigNodeLocation,
                        state,
                        e);
                if (getCycles() > RETRY_THRESHOLD) {
                    setFailure(new ProcedureException("State stuck at " + state));
                }
            }
        }
        return Flow.HAS_MORE_STATE;
    }

    @Override
    protected void rollbackState(ConfigNodeProcedureEnv env, AddConfigNodeState state)
            throws ProcedureException {
        switch (state) {
            case CREATE_PEER:
                env.deleteConfigNodePeer(tConfigNodeLocation);
                LOG.info("Rollback CREATE_PEER for: {}", tConfigNodeLocation);
                break;
            case ADD_PEER:
                env.removeConfigNodePeer(tConfigNodeLocation);
                LOG.info("Rollback ADD_PEER for: {}", tConfigNodeLocation);
                break;
            default:
                break;
        }
    }

    @Override
    protected boolean isRollbackSupported(AddConfigNodeState state) {
        switch (state) {
            case CREATE_PEER:
            case ADD_PEER:
                return true;
            default:
                return false;
        }
    }

    @Override
    protected AddConfigNodeState getState(int stateId) {
        return AddConfigNodeState.values()[stateId];
    }

    @Override
    protected int getStateId(AddConfigNodeState deleteStorageGroupState) {
        return deleteStorageGroupState.ordinal();
    }

    @Override
    protected AddConfigNodeState getInitialState() {
        return AddConfigNodeState.ADD_CONFIG_NODE_PREPARE;
    }

    @Override
    public void serialize(DataOutputStream stream) throws IOException {
        stream.writeShort(ProcedureType.ADD_CONFIG_NODE_PROCEDURE.getTypeCode());
        super.serialize(stream);
        ThriftConfigNodeSerDeUtils.serializeTConfigNodeLocation(tConfigNodeLocation, stream);
    }

    @Override
    public void deserialize(ByteBuffer byteBuffer) {
        super.deserialize(byteBuffer);
        try {
            tConfigNodeLocation = ThriftConfigNodeSerDeUtils.deserializeTConfigNodeLocation(byteBuffer);
        } catch (ThriftSerDeException e) {
            LOG.error("Error in deserialize AddConfigNodeProcedure", e);
        }
    }

    @Override
    public boolean equals(Object that) {
        if (that instanceof AddConfigNodeProcedure) {
            AddConfigNodeProcedure thatProc = (AddConfigNodeProcedure) that;
            return thatProc.getProcId() == this.getProcId()
                    && thatProc.getState() == this.getState()
                    && thatProc.tConfigNodeLocation.equals(this.tConfigNodeLocation);
        }
        return false;
    }
}
